It has 2 chambers- one which fills with blood while sqeeuzing out the other chamber-and back & forth it goes acting as its own pumping station. It is surrounded by the paricardial sac which protects us from the heat generated by the friction of the movement involved.
Another brilliant design by the CREATOR.
A new heart also will I give you, and a new spirit will I put within you:
Ezekiel 36:26
Our beating heart should remind us that one day we will need a new one-both literally & spiritually